Elevator



Dec. 27, 1927.

s. M. HALSTEAD E1' AL ELEVATOR Filed Oct. 19. 1926 Fleune. J.

Patented Dec. .127, 1927.

UNITED STATES `STANLEY M. HALSTEAD AND ANTON I.

WrcxLAND, or SAN Josu, climronmn.

ELEVATOR.

Application lled October 19, 1926. Serial No. 142,630.

This invention relates particularly to that type of elevators wherein lluid pressure is utilized to actuate a vertically movable piston, reference bein made to 4our co ending application Serial o. 115,542, filed une 12, 1926, patented January 18,. 1927, No. 1,614,790. i

It is one object of the present invention to provide an elevator of the character indicated wherein the fluid is introduced into the cylinder and piston in such a manner as t0 simplify ,its construction, reduce the amount of material required in its construction, and in which the fluid pressure is applied in the simplest and most direct manner.

It is also an object of the invention to provide a structure of the character indicated wherein a simple and effective means is provided for positioning the fixed cylinder, and a self centering means inserted between the fixed and revoluble cylinders.

In the drawing.-

Figure 1 isa vertical transverse section through a structure embodying our invention taken on line 1-1 of Figure 2.

Figure 2 is a plan view of the structure, parts being broken away.

, Figure 3 is a section on line 3 3 of Fig# :lo ure 1.

Referring now more particularly to the drawing, we show at 1 a cylindrical pipe of suitable diameter having an annular member 2 mounted on its upper end, the inner perimeter 3 of the said member forming a bearing as hereinafter described. A bottom member 4 is mounted upon the lower end of the pipe 1 as shown, this member 4 being threaded at 5 to receive a supply pipe 6 4g and having an upstanding concentrically arranged boss 7 formed thereon with a spherical recess 8l formed in its'upper surface as shown. A conduit 9 connects the pipe 6 with the recess 8. In the pi e 6 is inserted a T 10 in such a'manner t at the axis of the head portion of the said T is coincident `with the axis of the member 4, and into the lower end of the T is mounted a pin 11.

In positioning the 'cylinder 1 a suitable 5o hole as 12 is made in the round and the said cylinder placed vertieay therein resting upon the pin 11. When vthe in 11 has been driven into the ground a 'stance to bring the top ofthe cylinder to the desired i level'the space between the cylinder 1 and thewalls of the hole 12 is filled with concrete. At 13 we show a second cylinder of less dlameter than the first cylinder and provided with a slightly tapering upper portion 14 carrying an outwardly extending liange 15 adapted to engage the bearing surface 3 of member 2. A bottom member 16 is mounted upon the lower end of the cylinder 13, this member having a conduit 17 formed 1n its axis of rotation. An upstanding pipe 18 is concentrically mounted4 in its upper surface 1n communication with the conduit 17, and a semi-spherical foot is concentrically mounted upon its llower surface as at 19 and provided with a conduit 20. When this cylinder 13 is inserted 'in cylinder 1 it is automatically centered by the foot 19 engagmg recess 8 and the iange 15engaging bearing surface 3. When in this position the pipe 6 communicates at all times with pipe 18 through conduits 9, 2O and 1 7 and yet the cylinder 13 is permitted to rotate freely in cylinder 1.

A piston is shown at 21, the same being hollow and having a concentrically arranged orifice in its lower end as at 22 to permit the passage of pipe 18 therethrough and the passage of liquid from the piston to the cylinder 13. This piston has an outside diam? eter substantially equal to the inner diameter of the upper end of the cylinder 13, and a head 23 closely fitting the cylinder 13. Cn the closed upper end of the piston 21 is mourited any suitable head such as shown at 2 When the elevator has been constructed and assembled as described the piston is elevated by forcing a liquid under pressure into piston 21 and thence through the orifice 22 into cylinder 13 where it is applied against the piston head 23 to move it upwardly. When the pressure of the liquid is released the piston descends thereby forcing the iluid in cylinder 13 back vinto the 100 piston 21. The construction is such that the piston ma be reciprocated at will, and yet p through t e construction of the fixed and revoluble cylinders 1 and 13 it may also be rotated as desired without interru ting the 105 iow of liquid through the conduits to the interior of the cylinder.

It is to be understood, of course, that while we have herein shown and described but one specific embodiment of our inven- 11o comprisin a ixcd vertical cylinder, a second cylinder concentrically mounted therein and having an annular bearing contact therewith at its upper end and a pivotal bearing thereon at its lower end, a conduit entering the second cylinder through said pivotal bearing, and a piston mounted to reciprocate insaid second cylinder.

3. An elevator of the character describen comprising a fixed vertical cylinder, a second cylinder revolubly mounted therein, a holow piston closed at its upper end and having an orifice in its lower end mounted to reciprocate in said second cylinder, and a supply conduit formed in the adjacent bottom ends of the two cylinders and concentrically arranged relative thereto and passing upwardly through the orifice in said piston `to a point above the lower end of the piston when said piston is fully extended.

4STANLEY M. HALSTEAD.

ANTON I. WICKLAND. 

